The researchers of the School of Sciences of the University of Navarra Javier Oscoz, David Galicia and Rafael Miranda, together with other Spanish experts, and in collaboration with the Hydrographic Confederation of the Ebro (CHE), have written a reference document for the identification of the macroinvertebrates of the Ebro river basin. In this guide a total of 23 invasive species are documented; it is the first guide to these animals published in Spain.